Is it any wonder the embattled belter quick-stepped it out of a London clinic yesterday, just one day after checking herself in?

London’s Daily Mail is reporting that Wine-O was out partying with friends until 4:30 Tuesday morning after absenting from the hospital, hitting up concert venue the Monarch and a kebab shop before bringing the bash back to her pad.

Sources say Winehouse was adamant about leaving the clinic after Sunday’s Glastonbury fiasco.

“She told [her father] Mitch: ‘I’m climbing the walls in here. I need to get out,’ ” the insider reveals. “[Mitch] realized that he had to let her leave, otherwise he’d have no control over where she goes and what she gets up to.”

Winehouse’s next stop may well be Pentonville Prison, where incarcerated hubby Blake Fielder-Civil is currently awaiting sentencing. The Sun released several raunchy, if error-ridden, letters Fielder-Civil wrote to his pokey pen pal, Melissa Goldstone.

Blake, who is in for perverting the course of justice, relayed various sex fantasies to Goldstone, such as, “I squeeze your throat whilst your [sic] s*ck me and I ask you if your [sic] a dirty b*tch.”

He even hinted that the two might take a six-month sex-and-drugs romp in Thailand, writing, “We can just sun ourselves, I can f*** you all over the country and the gear there is f****** unreal!!! Something to look forward to innit??”

Wow, sounds like the course of justice wasn’t the only thing the guy’s been perverting.

Amy’s been known to head-butt complete strangers. Who knows what she’ll unleash on a husband who’s been catting around via the postal system?